An embarrassing mistake brings Ryuuji Takasu and Taiga Aisaka together, leading to an unexpected discovery: each has a crush on the other's best friend. Taiga likes Yuusaku Kitamura, the popular vice president and Ryuuji's closest friend, while Ryuuji has feelings for Minori Kushieda, Taiga's best friend. They agree to help one another pursue those romances.
The alliance pairs two high school students whose looks tell very different stories from their personalities. Ryuuji's intimidating face earns him a delinquent reputation, despite his gentle nature and fondness for housework. Small and doll-like, Taiga is instead known for her fiery temper and wooden katana, earning her the nickname “Palmtop Tiger.” Yet Ryuuji also discovers a sweeter side to his unlikely partner.
